1 /* 2 * Copyright (C) 2015 Red Hat, Inc. 3 * All Rights Reserved. 4 * 5 * Authors: 6 * Dave Airlie <airlied@redhat.com> 7 * Gerd Hoffmann <kraxel@redhat.com> 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the "Software"), 11 * to deal in the Software without restriction, including without limitation 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 13 * and/or sell copies of the Software, and to permit persons to whom the 14 * Software is furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice (including the next 17 * paragraph) shall be included in all copies or substantial portions of the 18 * Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 23 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 26 * OTHER DEALINGS IN THE SOFTWARE. 27 */ 28 29 #include <linux/module.h> 30 #include <linux/pci.h> 31 #include <linux/poll.h> 32 #include <linux/wait.h> 33 34 #include <drm/drm.h> 35 #include <drm/drm_aperture.h> 36 #include <drm/drm_atomic_helper.h> 37 #include <drm/drm_drv.h> 38 #include <drm/drm_file.h> 39 40 #include "virtgpu_drv.h" 41 42 static const struct drm_driver driver; 43 44 static int virtio_gpu_modeset = -1; 45 46 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); 47 module_param_named(modeset, virtio_gpu_modeset, int, 0400); 48 49 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev) 50 { 51 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent); 52 const char *pname = dev_name(&pdev->dev); 53 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 54 char unique[20]; 55 int ret; 56 57 DRM_INFO("pci: %s detected at %s\n", 58 vga ? "virtio-vga" : "virtio-gpu-pci", 59 pname); 60 if (vga) { 61 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver); 62 if (ret) 63 return ret; 64 } 65 66 /* 67 * Normally the drm_dev_set_unique() call is done by core DRM. 68 * The following comment covers, why virtio cannot rely on it. 69 * 70 * Unlike the other virtual GPU drivers, virtio abstracts the 71 * underlying bus type by using struct virtio_device. 72 * 73 * Hence the dev_is_pci() check, used in core DRM, will fail 74 * and the unique returned will be the virtio_device "virtio0", 75 * while a "pci:..." one is required. 76 * 77 * A few other ideas were considered: 78 * - Extend the dev_is_pci() check [in drm_set_busid] to 79 * consider virtio. 80 * Seems like a bigger hack than what we have already. 81 * 82 * - Point drm_device::dev to the parent of the virtio_device 83 * Semantic changes: 84 * * Using the wrong device for i2c, framebuffer_alloc and 85 * prime import. 86 * Visual changes: 87 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer, 88 * will print the wrong information. 89 * 90 * We could address the latter issues, by introducing 91 * drm_device::bus_dev, ... which would be used solely for this. 92 * 93 * So for the moment keep things as-is, with a bulky comment 94 * for the next person who feels like removing this 95 * drm_dev_set_unique() quirk. 96 */ 97 snprintf(unique, sizeof(unique), "pci:%s", pname); 98 return drm_dev_set_unique(dev, unique); 99 } 100 101 static int virtio_gpu_probe(struct virtio_device *vdev) 102 { 103 struct drm_device *dev; 104 int ret; 105 106 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1) 107 return -EINVAL; 108 109 if (virtio_gpu_modeset == 0) 110 return -EINVAL; 111 112 dev = drm_dev_alloc(&driver, &vdev->dev); 113 if (IS_ERR(dev)) 114 return PTR_ERR(dev); 115 vdev->priv = dev; 116 117 if (!strcmp(vdev->dev.parent->bus->name, "pci")) { 118 ret = virtio_gpu_pci_quirk(dev, vdev); 119 if (ret) 120 goto err_free; 121 } 122 123 ret = virtio_gpu_init(dev); 124 if (ret) 125 goto err_free; 126 127 ret = drm_dev_register(dev, 0); 128 if (ret) 129 goto err_deinit; 130 131 drm_fbdev_generic_setup(vdev->priv, 32); 132 return 0; 133 134 err_deinit: 135 virtio_gpu_deinit(dev); 136 err_free: 137 drm_dev_put(dev); 138 return ret; 139 } 140 141 static void virtio_gpu_remove(struct virtio_device *vdev) 142 { 143 struct drm_device *dev = vdev->priv; 144 145 drm_dev_unplug(dev); 146 drm_atomic_helper_shutdown(dev); 147 virtio_gpu_deinit(dev); 148 drm_dev_put(dev); 149 } 150 151 static void virtio_gpu_config_changed(struct virtio_device *vdev) 152 { 153 struct drm_device *dev = vdev->priv; 154 struct virtio_gpu_device *vgdev = dev->dev_private; 155 156 schedule_work(&vgdev->config_changed_work); 157 } 158 159 static struct virtio_device_id id_table[] = { 160 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID }, 161 { 0 }, 162 }; 163 164 static unsigned int features[] = { 165 #ifdef __LITTLE_ENDIAN 166 /* 167 * Gallium command stream send by virgl is native endian. 168 * Because of that we only support little endian guests on 169 * little endian hosts. 170 */ 171 VIRTIO_GPU_F_VIRGL, 172 #endif 173 VIRTIO_GPU_F_EDID, 174 VIRTIO_GPU_F_RESOURCE_UUID, 175 VIRTIO_GPU_F_RESOURCE_BLOB, 176 VIRTIO_GPU_F_CONTEXT_INIT, 177 }; 178 static struct virtio_driver virtio_gpu_driver = { 179 .feature_table = features, 180 .feature_table_size = ARRAY_SIZE(features), 181 .driver.name = KBUILD_MODNAME, 182 .driver.owner = THIS_MODULE, 183 .id_table = id_table, 184 .probe = virtio_gpu_probe, 185 .remove = virtio_gpu_remove, 186 .config_changed = virtio_gpu_config_changed 187 }; 188 189 module_virtio_driver(virtio_gpu_driver); 190 191 MODULE_DEVICE_TABLE(virtio, id_table); 192 MODULE_DESCRIPTION("Virtio GPU driver"); 193 MODULE_LICENSE("GPL and additional rights"); 194 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>"); 195 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>"); 196 MODULE_AUTHOR("Alon Levy"); 197 198 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops); 199 200 static const struct drm_driver driver = { 201 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC, 202 .open = virtio_gpu_driver_open, 203 .postclose = virtio_gpu_driver_postclose, 204 205 .dumb_create = virtio_gpu_mode_dumb_create, 206 .dumb_map_offset = virtio_gpu_mode_dumb_mmap, 207 208 #if defined(CONFIG_DEBUG_FS) 209 .debugfs_init = virtio_gpu_debugfs_init, 210 #endif 211 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 212 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 213 .gem_prime_mmap = drm_gem_prime_mmap, 214 .gem_prime_import = virtgpu_gem_prime_import, 215 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, 216 217 .gem_create_object = virtio_gpu_create_object, 218 .fops = &virtio_gpu_driver_fops, 219 220 .ioctls = virtio_gpu_ioctls, 221 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS, 222 223 .name = DRIVER_NAME, 224 .desc = DRIVER_DESC, 225 .date = DRIVER_DATE, 226 .major = DRIVER_MAJOR, 227 .minor = DRIVER_MINOR, 228 .patchlevel = DRIVER_PATCHLEVEL, 229 230 .release = virtio_gpu_release, 231 }; 232